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Hi,
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Here is a website that will tell you where to look for your particular engine number and how to obtain original tecumseh parts. good luck with it. if you need any other assistance please get back. i really do want to help you get your tiller running again.

let it surge, it will usually get better as it warms up. These 6.5 Hp engines are fine except they have an cheap badly designed carburator. Nothing can be done about this problem. They all surge eventually.

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Only of you have ran the engine out of oil...Sounds like the carbs may not be set correctly.. .Did a professional do the rebuild?..What exactly was "rebuilt".. were any parts replaced?
Sounds like the low speed (pilot jets/air screw passages may not be clean as they need to be??)
Please check the compression on each cylinder..remove the spark plugs... hold the throttle (carbs) wide open when you check this.. spin the motor for 5-8 seconds... you should get 120psi. minimum..(and less than 10psi difference).. if less, it might be time to actually rebuild the top end..(new pistons/rings/hone cyl.).. only bore it if absolutely necessary.. get it measured..

There are only 3 parts in a two-cycle carb that ever need to be replaced,,(unless they are actually broken) The needle and seat assy., the jet needle and the needle jet. ..see pic... parts # 41 = needle and seat assy. #6 = jet needle, #37 = needle jet.

The needle and seat regulate the flow of gas into the carb as the floats rise and fall..,, if they are damaged or leaking the carb will overflow with gas., the needle jet is a orifice with a specific size..The jet needle has a specific size, taper, and length..== The jet needle and needle jet work in unison to regulate the flow of gas from right off idle all the way to WFO..the needle jet/jet needle WILL wear over time causing the fuel/air mixture to become richer and richer and start fouling spark plugs..(this is more pronounced on 4-cycle ATV's)...
I hope this has shed some light on your carb situation...
Good luck...
exploded view of mikuni carb Google Search

Try adjusting you mixture a little richer, 1/8 turn on the fuel screw. If this doesn't help get to idle, you will need to rebuild the carb. make sure you get a complete kit to include the float and throttle springs as well as jets and gaskets. Write down your initial mixture settings and try them again on your rebuilt carb. Should be fine. Bending float arms for travel length is tricky, be careful as they can easily break off making them useless. The rest of the process is pretty straightforward. Ensure you place the needle jet keeper ring on the correct groove and the throttle moves smoothly against the spring tension on the cable above the needle valve.

If it's back firing through the carb, usually means it's running too lean, this can be from the float if equipped is set too low, and/or air leaking somewhere. If you made no other changes (new exhaust system for example) and it ran fine up until a problem required a rebuild, double check your work, jets are in tight, no extra gaskets or o rings left from the kit, float level, be sure everything is re installed tight and right. Carbs a fussy, they'll run forever but with little provocation give you a headache.

starving for fuel. first check for bad/old gas, then restrictions in the fuel delivery including fuel line, filter, or buildup of debris in tank or any sharp bends or 90deg. fittings. then pull the float bowl and make sure the float is regulating fuel fuel into the bowl, but most likely your main jet is plugged. use a fine piece of wire like guitar string to runthru the jet located at the lowest part of the carb that hangs down into the float bowl. the jet will be on the side or bottom of this lower piece. put bowl back on, get gas to the carb and recheck starting problem. good luck. R

there are rebuild kits for some but not all, check your local jd dealer, my family ownd a jd dealer until last year jd stuff aint cheap. personally id type hydraulic cylinders into google and buy a replacement

let it surge, it will usually get better as it warms up. These 6.5 Hp engines are fine except they have an cheap badly designed carburator. Nothing can be done about this problem. They all surge eventually.